Tā píngshí chénmò-guǎyán, dàn sīxià lǐ hé'ǎi-kěqīn.
He is usually quiet, but in private he is warm and approachable.
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Break it down: 和 (harmonious) + 蔼 (gentle, kind) + 可 (able to) + 亲 (be close to). Literally: 'harmoniously gentle and able to get close to' - a person so warm you naturally want to approach them.
